third_party/ulib/musl/src/time/timegm.c

#define _GNU_SOURCE
#include "time_impl.h"
#include <errno.h>

time_t timegm(struct tm* tm) {
    struct tm new;
    long long t = __tm_to_secs(tm);
    if (__secs_to_tm(t, &new) < 0) {
        errno = EOVERFLOW;
        return -1;
    }
    *tm = new;
    tm->tm_isdst = 0;
    tm->__tm_gmtoff = 0;
    tm->__tm_zone = __gmt;
    return t;
}